//
//  CZMainTabBar.swift
//  iOS9GZweibo
//
//  Created by 王应明 on 16/3/24.
//  Copyright © 2016年 itcast. All rights reserved.
//

import UIKit
let TabBarItemCount = 5

class CZMainTabBar: UITabBar {

    override func layoutSubviews() {
        super.layoutSubviews()
        let width = frame.width / CGFloat(TabBarItemCount)
        
        var index = 0
        for view in subviews {
            let cls = NSClassFromString("UITabBarButton")
            if view.isKindOfClass(cls!) {
                
                view.frame = CGRect(x:CGFloat (index) * width , y: 0, width: width, height: frame.height)
                index += index == 1 ? 2 : 1
            }
            
        }
        composeButton.frame = CGRect(x: 2 * width, y: 0, width: width, height: frame.height)
    }
    
    
    
   //MARK: - 懒加载
    private lazy var composeButton: UIButton = {
        let button = UIButton()
        
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        button.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        button.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        self.addSubview(button)
        return button
    }()
}
